Between PRO and COMP CARBON are many differences and Display, Mastermind TCU, better Fork, and with rear shock upgrades, you get Long travel Turbo Levo with better, upgraded progression and tune.
Just make sure, that you will get = buy other original carbon parts from PRO model (handlebar...
Tested and the best option for rear is an @SicoMTB 🔝🚵♂️🎼🎯
Perfect fit and good protection of the frame with sufficient coverage, and overall - still looks nice...
The best compare and visualize can be seen at:
https://www.bike-stats.de/en/
Try the S3 size, compare it to S4, but it depends what you will ride. But my suggestion to you is S3.
I'm 183cm tall and had choosen S4 size.
All the best.